I just checked for you and the Italeri rear plate fits the Kinetic turret perfectly. It seems the Italeri and Kinetic kits are the same size and parts would be interchangable. You could use some of the Italeri M109 parts (which are included as "Parts Not Used" on the Italeri M109A2/E4 kit); pantel, turret rear plate and ammo doors, etc.
Gino P. Quintiliani
Field Artillery --- The KING of BATTLE!!!